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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 30 |
| 2 | 870 |
| 3 | 25230 |
| 4 | 731670 |
| 5 | 21217995 |
| 6 | 615309240 |
| 7 | 17843602560 |
| 8 | 517453877640 |
| 9 | 15005855150160 |
| 10 | 435160887802830 |
| 11 | 12619407316577880 |
| 12 | 365955317872798920 |
| 13 | 10612486887830912280 |
| 14 | 307755817292235608520 |
| 15 | 8924735934026717183820 |
[1,30,870,25230,731670,21217995,615309240, 17843602560,517453877640,15005855150160, 435160887802830,12619407316577880, 365955317872798920,10612486887830912280, 307755817292235608520,8924735934026717183820] |